EP 0035803 A2 19810916 - Disc spindle servo system.
Title (en)
Disc spindle servo system.
Title (de)
Servosystem für einen Plattenspeicher-Spindelmotor.
Title (fr)
Servo-système pour un arbre moteur d'une mémoire à disques.
Publication
Application
Priority
US 89067078 A 19780327
Abstract (en)
An optical apparatus is described for use with a video disc (7) having frequency modulated video information (9) recorded thereon in the form of a plurality of concentric circles or a single spiral. The information track comprises successively positioned light reflective and light non-reflective regions (10, 11). A focused light beam (4) is caused to be positioned over the center of an information track and the light reflected from the information track is garthered by an obective lens (17) for application to electronic circuitry (30) for recovering the recorded frequency modulated video signals A servo system for controlling the speed of the motor (48) for rotating the disc compares the measured speed of rotation with a reference signal derived from a colour subcarrier frequency signal in a manner to remove fixed time base errors.
IPC 1-7
IPC 8 full level
H04N 5/85 (2006.01); G02B 7/28 (2006.01); G11B 7/00 (2006.01); G11B 7/005 (2006.01); G11B 7/08 (2006.01); G11B 7/085 (2006.01); G11B 7/09 (2006.01); G11B 7/095 (2006.01); G11B 7/12 (2012.01); G11B 19/28 (2006.01); G11B 21/08 (2006.01); G11B 21/10 (2006.01); H04N 5/93 (2006.01); H04N 9/85 (2006.01); H04N 9/87 (2006.01); H04N 9/89 (2006.01)
CPC (source: EP)
G11B 7/005 (2013.01); G11B 7/08 (2013.01); G11B 7/08511 (2013.01); G11B 7/09 (2013.01); G11B 7/0941 (2013.01); G11B 7/12 (2013.01); G11B 19/28 (2013.01); G11B 21/10 (2013.01); G11B 7/0908 (2013.01)
Designated contracting state (EPC)
BE CH DE FR GB IT NL SE
DOCDB simple family (publication)
EP 0035289 A2 19810909; EP 0035289 A3 19820310; CA 1140675 A 19830201; DE 2911859 A1 19791004; DE 2911859 C2 19880511; DE 2967537 D1 19851205; DK 20079 A 19790928; EP 0004476 A1 19791003; EP 0004476 B1 19851030; EP 0035287 A2 19810909; EP 0035287 A3 19820414; EP 0035287 B1 19850619; EP 0035288 A2 19810909; EP 0035288 A3 19820310; EP 0035288 B1 19850911; EP 0035803 A2 19810916; EP 0035803 A3 19820224; EP 0035803 B1 19850306; EP 0036222 A2 19810923; EP 0036222 A3 19820224; EP 0036222 B1 19850710; HK 18089 A 19890310; HK 18189 A 19890310; HK 50586 A 19860711; HK 50686 A 19860711; HK 50786 A 19860711; JP 2500226 B2 19960529; JP 2594412 B2 19970326; JP 2617270 B2 19970604; JP 2763084 B2 19980611; JP H03162723 A 19910712; JP H0329118 A 19910207; JP H033289 B2 19910118; JP H0434208 B2 19920605; JP H06325375 A 19941125; JP H063646 B2 19940112; JP H0727646 B2 19950329; JP H076378 A 19950110; JP H0795516 A 19950407; JP H08147719 A 19960607; JP S54128707 A 19791005; JP S6111968 A 19860120; JP S6111969 A 19860120; JP S615692 A 19860111; JP S61930 A 19860106; JP S6259520 B2 19871211; JP S6323230 A 19880130; JP S6323231 A 19880130; JP S6356612 B2 19881108; JP S6367255 B2 19881223; MY 8700035 A 19871231; MY 8700045 A 19871231; MY 8700046 A 19871231; NL 7900352 A 19791001; NO 151872 B 19850311; NO 151872 C 19850619; NO 790171 L 19790928; SE 7813460 L 19790928
DOCDB simple family (application)
EP 81200105 A 19790327; CA 322447 A 19790228; DE 2911859 A 19790326; DE 2967537 T 19790327; DK 20079 A 19790117; EP 79300489 A 19790327; EP 81200101 A 19790327; EP 81200102 A 19790327; EP 81200103 A 19790327; EP 81200104 A 19790327; HK 18089 A 19890302; HK 18189 A 19890302; HK 50586 A 19860703; HK 50686 A 19860703; HK 50786 A 19860703; JP 1158294 A 19940203; JP 1158394 A 19940203; JP 21887193 A 19930902; JP 2667285 A 19850215; JP 2667385 A 19850215; JP 2667485 A 19850215; JP 2667585 A 19850215; JP 348579 A 19790118; JP 4231794 A 19940314; JP 6089290 A 19900312; JP 6089390 A 19900312; JP 8489787 A 19870408; JP 8489887 A 19870408; MY 8700035 A 19871230; MY 8700045 A 19871230; MY 8700046 A 19871230; NL 7900352 A 19790117; NO 790171 A 19790118; SE 7813460 A 19781229